body {
    /*把背景图片放大到适合元素容器的尺寸，图片比例不变*/
    background-size: cover;
    background-image: url('../IMAGES/student_backgrond.jpg');
    font-family: Arial, Helvetica, sans-serif;
    text-align: center;
}

h1 {
    text-align: center;
    color: rgba(0, 0, 0, .7);
    margin-top: 0;
}


fieldset {
    border: 0;
    border-radius: 50px;
    color: rgb(76, 42, 30);
    background-color: rgba(255, 142, 101, 0.356);
    margin: 0 auto;
    max-width: 800px;
    /* 内边距 */
    padding: 40px;
    text-align-last: left;
}

legend {
    font-size: larger;
}

fieldset:hover,
input[type="submit"]:hover {
    box-shadow: 10px 10px 30px rgba(0, 0, 0, 0.6);
}

label {

    /* 下边距 */
    margin-bottom: 10px;
    color: rgba(0, 0, 0, .7);
}

input {
    padding: 5px;
    border-radius: 12px;
    border: none;
    margin-bottom: 13px;

}

input[type="submit"] {
    background-color: #ffcab3b6;
    color: #000000;
    padding: 10px;
    border: none;
    border-radius: 20px;
    /* 设定鼠标形状 pointer-手 crosshair-十字 default-箭头*/
    cursor: pointer;
    margin-top: 20px;
}